My almost 3 year old woke up about 2 hours ago with a rash. At first it looked like he slept on an ant hill, it has increased a bit over the past hour. he is still playing, etc, and not complaining. I put some cortisone cream and witch hazel on it .Should I wait to see if it gets worse ? I am in Az., and it is 112 outside, but he has been mostly inside at 80 degrees.